CVE-2019-14899

A vulnerability was discovered in Linux, FreeBSD, OpenBSD, MacOS, iOS, and Android that allows a malicious access point, or an adjacent user, to determine if a connected user is using a VPN, make positive inferences about the websites they are visiting, and determine the correct sequence and acknowledgement numbers in use, allowing the bad actor to inject data into the TCP stream. This provides everything that is needed for an attacker to hijack active connections inside the VPN tunnel.

Weakness

The product does not adequately verify the identity of actors at both ends of a communication channel, or does not adequately ensure the integrity of the channel, in a way that allows the channel to be accessed or influenced by an actor that is not an endpoint.

Affected Software

Potential Mitigations

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/466.html
• https://cwe.mitre.org/data/definitions/57.html
• https://cwe.mitre.org/data/definitions/589.html
• https://cwe.mitre.org/data/definitions/590.html
• https://cwe.mitre.org/data/definitions/612.html
• https://cwe.mitre.org/data/definitions/613.html
• https://cwe.mitre.org/data/definitions/615.html
• https://cwe.mitre.org/data/definitions/662.html
• https://cwe.mitre.org/data/definitions/94.html

References

• http://seclists.org/fulldisclosure/2020/Dec/32
• http://seclists.org/fulldisclosure/2020/Jul/23
• http://seclists.org/fulldisclosure/2020/Jul/24
• http://seclists.org/fulldisclosure/2020/Jul/25
• http://seclists.org/fulldisclosure/2020/Nov/20
• http://www.openwall.com/lists/oss-security/2020/08/13/2
• http://www.openwall.com/lists/oss-security/2020/10/07/3
• http://www.openwall.com/lists/oss-security/2021/07/05/1
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14899
• https://openvpn.net/security-advisory/no-flaws-found-in-openvpn-software/
• https://support.apple.com/kb/HT211288
• https://support.apple.com/kb/HT211289
• https://support.apple.com/kb/HT211290
• https://support.apple.com/kb/HT211850
• https://support.apple.com/kb/HT211931